Development of Tools for Prediction and Reduction of Jet and System Noise

Development of Tools for Prediction and Reduction of Jet and System Noise

PhD student:	Mattias Billson billson@chalmers.se
Supervisor:	Lars Davidson lada@chalmers.se
Supervisor:	Lars-Erik Eriksson lee@chalmers.se
Cooperation:	Volvo Aero Corp.
Sponsors:	NFFP
Publications:	[1-8]
Start of project:	December 1999
End of project:	July 2004

THE PROJECT
Acoustic noise emission has in recent years become an increasingly important factor in the design of new commercial aero-engines due to stricter and stricter international regulations. Although modern high-bypass ratio fan-jet engines already have significantly reduced jet noise emissions as compared to older engines, further reductions will be necessary in order to meet the new demands foreseen for the next decade. At take-off conditions both fan noise from the intake and jet/core/turbine noise from the exhaust are important, whereas at approach and landing conditions exhaust core noise is often the dominating component. Since VAC (Volvo Aero Corp.) is involved with the design and manufacturing of vital parts of the exhaust system of several commercial engines (turbine exhaust casings, etc), increased knowledge in the area of exhaust noise is desirable. Such knowledge, together with reliable computational tools, would help the designer to optimise between performance, noise emissions, life expectancy and maintenance. New noise reduction technologies such as overlapping deswirl vanes and/or surface treatment (acoustic liners) may also be investigated and evaluated for exhaust systems in a relatively inexpensive manner.

The overall objective of this proposed task is to model the generation and propagation of acoustic noise in aero-engine exhaust systems. The focus of the work will be on modern commerial engines of high-bypass ratio fan-jet type.

REFERENCES

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M. Billson and L.-E. Eriksson and L. Davidson
"Acoustic Source Terms for the Linear Euler Equations on Conservative Form", AIAA paper 2002-2582, Breckenridge, 2002
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M. Billson
"Computational Techniques for Jet Noise Predictions", Rept. 02/02, thesis of Lic. of Engng, Dept. of Thermo and Fluid Dynamics, Chalmers University of Technology, Göteborg, 2002.
View compressed ps file
M. Billson and L.-E. Eriksson and L. Davidson
"Jet Noise Prediction Using Stochastic Turbulence Modeling", "AIAA paper 2003-3282, 9th AIAA/CEAS Aeroacoustics Conference", Hilton Head, May 2003
View ps file
M. Billson, L.-E. Eriksson, L. Davidson and P. Jordan
"Modeling of Synthetic Anisotropic Turbulence and its Sound Emission", 10th AIAA/CEAS Aeroacoustics Conference, AIAA 2004-2857, Manchester, United Kindom, 2004.
View PDF file
M. Billson, L.-E. Eriksson and L. Davidson
Jet Noise Modeling Using Synthetic Anisotropic Turbulence", 10th AIAA/CEAS Aeroacoustics Conference, AIAA 2004-3028, Manchester, United Kindom, 2004.
View PDF file
M. Billson, L.-E. Eriksson, P. Jordan and L. Davidson
"Anisotropic Formulation of the Velocity Correlation Tensor", Dept. of Thermo and Fluid Dynamics, Chalmers University of Technology", Göteborg, Sweden, 2004
View PDF file
M. Billson
"Computational Techniques for Turbulence Generated Noise", PhD thesis, Dept. of Thermo and Fluid Dynamics, Chalmers University of Technology", Göteborg, Sweden, 2003
View PhD thesis (PDF file)

View Errata (PDF file)
M. Billson and L.-E. Eriksson and L. Davidson
"Acoustic Source Terms for the Linear Euler Equations on Conservative Form", AIAA J., Vol. 43, No. 4, pp. 752-759, 2005

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